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Information on the Aromatic Structure of Internal Diesel Injector Deposits From Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS)
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 01, 2014 by SAE International in United States
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The nature of internal diesel injector deposits (IDID) continues to be of importance to the industry, with field problems such as injector sticking, loss of power, increased emissions and fuel consumption being found. The deposits have their origins in the changes in emission regulations that have seen increasingly severe conditions experienced by fuels because of high temperatures and high pressures of modern common rail systems and the introduction of low sulphur fuels. Furthermore, the effect of these deposits is amplified by the tight engineering tolerances of the moving parts of such systems. The nature and thus understanding of such deposits is necessary to both minimising their formation and the development of effective diesel deposit control additives (DCA).
The focused ion beam technique coupled with time of flight secondary -ion mass spectrometry (ToF-SIMS) has the ability to provide information on diesel engine injector deposits as a function of depth for both organic and inorganic constituents. Our previous work with this novel technique is unique in that it has shown layering effects in deposits which may be due to the residual fuel either evaporating and leaving residues or being unable to keep insoluble residues in solution during the injection process. As part of our on-going work to understand the nature of field deposits, the aromatic compounds present have been investigated. To help interpret the results for the aromatic structures present, spectra of a model polycyclic aromatic hydrocarbon (PAH), coronene (C24H12), and coal tar pitch (CTP) have been used as a basis to determine the ring structure of internal diesel; deposits. This work confirms the presence of aromatic ring structures of greater than six rings in composition in injector needle carbonaceous deposits.
CitationBarker, J., Snape, C., and Scurr, D., "Information on the Aromatic Structure of Internal Diesel Injector Deposits From Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS)," SAE Technical Paper 2014-01-1387, 2014, https://doi.org/10.4271/2014-01-1387.
- Cook, S. and Richards, P., “Possible Influence of High Injection Pressure on Diesel Fuel Stability: A Review and Preliminary Study,” SAE Technical Paper 2009-01-1878, 2009, doi:10.4271/2009-01-1878.
- T Covert: Diesel Fuel tank Delamination/Corrosion and Fuel Information, ASTM D02 Meeting Fuel Corrosivity Workshop Kansas City MO July 1 2010.
- API study 10001550 Corrosion in Systems Storing and Dispensing Ultra Low Sulphur Diesel (ULSD), Hypothesis Investigation Battelle Memorial Institute Sep 5th 2012.
- Barker, J., Snape, C., and Scurr, D., “A Novel Technique for Investigating the Characteristics and History of Deposits Formed Within High Pressure Fuel Injection Equipment,” SAE Int. J. Fuels Lubr. 5(3):1155-1164, 2012, doi:10.4271/2012-01-1685.
- Barker, J., Richards, P., Snape, C., and Meredith, W., “A Novel Technique for Investigating the Nature and Origins of Deposits Formed in High Pressure Fuel Injection Equipment,” SAE Int. J. Fuels Lubr. 2(2):38-44, 2009, doi:10.4271/2009-01-2637.
- Barker, J., Richards, P., Pinch, D., and Cheeseman, B., “Temperature Programmed Oxidation as a Technique for Understanding Diesel Fuel System Deposits,” SAE Int. J. Fuels Lubr. 3(2):85-99, 2010, doi:10.4271/2010-01-1475.
- Barker, J., Richard, P., Snape, C., and Meredith, W., “Diesel Injector Deposits - An Issue That Has Evolved with Engine Technology,” SAE Technical Paper 2011-01-1923, 2011, doi:10.4271/2011-01-1923.